VT101 8085 CPU Fault

js at cimmeri.com js at cimmeri.com
Mon Feb 16 16:34:54 CST 2015

On 2/16/2015 3:38 PM, Robert Jarratt wrote:
>>> I have checked the ESR on all the electrolytics, they are all fine.
>>> Prior to all this I had replaced C439 with a higher voltage rated
>>> component, as recommended here: https://trmm.net/VT100. I used a 100uF
>>> part, rated at 100V. I had also replaced C437 as that had a high ESR
>>> prior to seeing this problem.
>>> Is there anything else I should check?
>> ESR alone is not enough to validate
>> capacitors.
> What other tests would you suggest? I do have a capacitance meter to check
> values. I would have desolder them of course. Would you test just the
> electrolytics or all of them? I don't have an insulation tester though. Any
> other tests?
> Regards
> Rob

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- J.

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